Nutrient cycling over five years of mixed-species plantations of Eucalyptus and Acacia on a sandy tropical soil

Santos, Felipe Martini; Chaer, Guilherme Montandon; Diniz, Anderson Ribeiro; Balieiro, Fabiano de Carvalho

doi:10.1016/j.foreco.2016.10.041

Cited by 73 publications

(29 citation statements)

References 45 publications

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“…Among the tree components, nutrient concentrations were generally highest in the needles; intermediate in branches, bark, or roots; and lowest in stemwood, a tendency that is widely documented in previous studies [33][34][35]. In this study, N, P, and K concentrations in stemwood decreased with age.…”

Section: Nutrient Concentrationssupporting

confidence: 82%

Nutrient Allocation to Different Compartments of Age-Sequence Larch Plantations in China

Wang

Chen

Sun

2019

Forests

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Increased demand for forest-derived biomass has led to more intensive harvesting practices. However, the export of large nutrient quantities with the harvested biomass may lead to the depletion of soil nutrients. Therefore, improved knowledge concerning macronutrient allocation (N, P, K, Ca, and Mg) to different components in forests along age sequences is crucial for their sustainable management. In this study, we quantified nutrient allocation to different ecosystem components, including trees, understorey, forest floor, and different soil depths within a chronosequence (6-, 15-, 23-, and 35-year-old) of larch plantations in China. We then assessed the danger of significant nutrient losses from whole tree harvesting (WTH). Nutrient amounts in trees increased with stand age due to an increase in biomass. Stems accounted for 59%–72% of tree biomass and contained 40%–50% of total tree nutrients in the 15- to 35-year-old stands. The forest floor’s nutrient quantities increased from the 6- to 23-year-old stands and then decreased in the 35-year-old plantations. Conversely, most soil indicators initially declined from 15- to 23-year-old stands and then increased in the 35-year-old stand. The total nutrient stocks were greatest in the soil (0–40 cm), which accounted for about 93%–99% of total nutrients in the larch ecosystem. These data indicate that WTH causes nutrient losses about 2.0–2.5 times higher than stem-only harvesting, when thinning 15- or clear-cut harvesting 23- and 35-year-old stands. However, nutrient losses by WTH have little effect on the soil nutrient pools. Prolonging the crop cycle of larch plantations may be beneficial to improve nutrient return through litterfall and allow available soil nutrients to recover.

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Section: Nutrient Concentrationssupporting

confidence: 82%

Nutrient Allocation to Different Compartments of Age-Sequence Larch Plantations in China

Wang

Chen

Sun

2019

Forests

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“…Santos et al [27] explained that there was a stoichiometric relationship between the N and the P in leaves and that a high N content in the soil implied a higher demand for P by the Eucalyptus. This explanation confirms a synergistic effect among these nutrients for Eucalyptus forests.…”

Section: Concentrations Of N and P In The Leaves And In The Littermentioning

confidence: 99%

Soil Chemical Attributes, Biometric Characteristics, and Concentrations of N and P in Leaves and Litter Affected by Fertilization and the Number of Sprouts per the Eucalyptus L’Hér. Strain in the Brazilian Cerrado

Godoi

Araújo

Buzetti

et al. 2018

Forests

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Given the lack of recommendations for the fertilization of Eucalyptus clones in the second production cycle, the effects of fertilizer rates and the number of sprouts per strain in terms of the soil chemical attributes, biometric characteristics, and the concentrations of N and P in the leaves and in the litter of Eucalyptus L'Hér. in the Brazilian Cerrado were evaluated. The experimental design was a randomized block with four replicates, arranged in a 2 × 4 factorial scheme: one or two sprouts per strain; four fertilizer rates (0, 50, 100, or 200% of 200 kg ha −1 of the formula 06-30-06 + 1.5% Cu + 1% Zn) applied immediately after sprout definition. The option of one sprout per strain yielded higher contents of organic matter (K, S, B, and Mn) in the 0.20-0.40-m layer, the leaf chlorophyll index, the diameter at breast height, and the height of the Eucalyptus 44 months after the definition of sprouts. However, N and P leaf concentrations and the wood volume did not differ as a function of the sprout numbers. The fertilizer dosage did not influence the wood volume, even in sandy soil with low fertility. Approximately 86% of the wood volume was obtained from the supply of soil and root nutrient reserves and 14% of this productivity is due to fertilization minerals. The adequate fertilization in the first cycle of the Eucalyptus supplies almost the entire nutritional demand of the forest in the second production cycle.

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“…Accrual in nutrients as soil N, P and C in A. mangium monocultures or in A. mangium mixed with non-Nfixing species is due to more effective and higher nutrient cycling and availability (Santos et al 2017a) and greater stimulation of microbial activity and dynamics in the litter (Bini et al 2012;Pereira et al 2018, Table 2). Distinct microbial communities have been reported in mixed A. mangium/E.…”

Section: Stimulating Microbial Activity and P Availabilitymentioning

confidence: 99%

“…A. mangium has a positive impact on tree growth and forest productivity Forrester et al 2013;Santos et al 2017a). At the end of the first 7-year rotation of A. mangium and Eucalyptus urophylla × grandis plantations established in the Congolese coastal plains, eucalypt growth had benefitted from the N 2 fixed by A. mangium, as shown by the higher wood biomass in the mixed-species than in pure eucalypt stands .…”

Section: Sustaining Forest Productivitymentioning

confidence: 99%

Acacia mangium Willd: benefits and threats associated with its increasing use around the world

Koutika¹,

Richardson

2019

For. Ecosyst.

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Background: Acacia mangium, a fast-growing tree native to parts of Indonesia, Papua New Guinea and Australia, has been cultivated outside its native environment and introduced into humid tropical lowland regions of Asia, South America and Africa over the last few decades. It is a multipurpose tree used in agroforestry, forestry and for restoration of degraded lands. It is also highly invasive in many regions where it has been introduced outside its native range. This paper reviews evidence of its obvious benefits and its negative impacts on biodiversity. Methods: A literature review on Australian acacias and especially on A. mangium was undertaken to highlight both benefits and threats associated with their increasing worldwide use outside their native ranges.Results: Through N 2 fixed from the atmosphere, A. mangium improves soil fertility, especially by increasing N status and soil C accretion when introduced to N-limited areas; it thus has the potential to restore nutrient cycling in degraded systems. No studies have, however, been done to assess the effectiveness of A. mangium in restoring biodiversity of degraded lands. Most Australian acacias have traits that facilitate invasiveness, and 23 species have been recorded as invasive to date. A. mangium has been reported as invasive in Asia, Indonesia, Pacific Islands, Indian Ocean Islands, southern Africa and Brazil. Research on other invasive Australian acacias in several parts of the world has elucidated the types of impacts that are likely in different types of ecosystems and key options for mitigating impacts. Conclusions:A. mangium has the potential to restore nutrient cycling in degraded systems, but is highly invasive wherever it is planted. Many parts of the world have a large invasion debt for this species. Experience with other invasive acacias around the world suggests a suite of interventions that could be used to reduce invasions and mitigate impacts. Careful risk assessments should be undertaken prior to any new plantings of this species.

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Nutrient cycling over five years of mixed-species plantations of Eucalyptus and Acacia on a sandy tropical soil

Cited by 73 publications

References 45 publications

Nutrient Allocation to Different Compartments of Age-Sequence Larch Plantations in China

Nutrient Allocation to Different Compartments of Age-Sequence Larch Plantations in China

Soil Chemical Attributes, Biometric Characteristics, and Concentrations of N and P in Leaves and Litter Affected by Fertilization and the Number of Sprouts per the Eucalyptus L’Hér. Strain in the Brazilian Cerrado

Acacia mangium Willd: benefits and threats associated with its increasing use around the world

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